Industry new

Electromagnetic flowmeter maintenance points introduction

Flow metering is widely used in industrial and agricultural production, national defense construction, scientific research and foreign trade, and various fields of people's lives. In the production of petroleum industry, from oil extraction, transportation, refining and smelting processing to trade sales, flow metering runs through the whole process. Flow measurement is inseparable from any link. Otherwise, normal production and trade relations of the petroleum industry will not be guaranteed. . In the chemical industry, inaccurate flow metering can cause imbalances in chemical composition ratios, failing to ensure product quality, and serious production safety accidents. In the power industry production, the measurement and regulation of medium, such as liquid, gas, steam, etc., plays an important role. Accuracy of flow metering is not only of great economic significance for ensuring that power plants operate under optimal parameters, but with the development of high-temperature and high-pressure large-capacity units, flow measurement has become an important part of ensuring the safe operation of power plants. If the instantaneous feed water flow rate of a large-capacity boiler is interrupted or reduced, it may cause a serious dry pan or pipe burst accident. This requires the flow measuring device not only to accurately measure, but also to issue an alarm signal in time. In the steel industry production, the flow measurement of circulating water and oxygen (or air) in the steelmaking process is one of the important parameters to ensure product quality. In the light industry, food, textile and other industries, it is also inseparable from the flow meter.

The flowmeter should try to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, large transformers, etc.) to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor. The flow signal line and the excitation line between the sensor scoop converters. However, from the analysis of damaged components in lightning faults, the induced high voltage and surge currents that cause faults are mostly introduced from the control room power line, and the other two approaches are less. Since the electromagnetic flowmeter measures much more than the other flow meters when measuring the suspended solid phase or the dirty body, the probability of failure of the inner wall adhesion layer is relatively high. If the adhesion layer conductivity is similar to the liquid conductivity. Common debug period failures are usually not properly installed.

Electromagnetic flowmeter is one of the most widely used medium measuring instruments in industrial production. Through electromagnetic flowmeter, we can measure the quality and flow of the medium to analyze whether the production process is normal. In industrial environments, electromagnetic flowmeters are generally used for some corrosive media measurements, so they need to be regularly maintained during use to ensure proper operation.

When the electromagnetic flowmeter is energized, the zero point must be adjusted while the electromagnetic flow sensor is full of liquid. After the operation, it is necessary to check the zero-point operation of the conditional stop flow; especially for the stacked, easily polluting electrodes, solid-rich non-cleaning liquid, should be checked in the early stage of operation to determine the normal viewing period. The electromagnetic flowmeter and the rectangular wave excitation ratio that communicate the excitation method are more prone to zero drift, so it is more important to pay attention to viewing and adjustment.

After the electromagnetic flowmeter is stopped, it is necessary to measure the resistance between the electrodes, and then disconnect the signal between the sensor and the converter, and whether the measuring instrument is within the manufacturer's specified value after being filled with liquid. The resistance value of each measurement needs to be recorded and saved, which can be used as the basis for judging the sensor failure of the electromagnetic flowmeter in the future.

PREVIOUS：How to do a good job of lightning protection NEXT：Electromagnetic flowmeter in the analysis of